package com.example.skycode6.dao;

import com.example.skycode6.bean.noticeBean;
import com.example.skycode6.util.DBConnection;
import com.example.skycode6.util.Time;

import java.sql.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class noticeDao {
    DBConnection DBConn = new DBConnection();

    // todo 完成增删改查功能
    public List<noticeBean> getList(int page) {
        Connection conn = DBConn.getConn();
        String sql = "select * from notice limit " + (page - 1) * 10 + ",10";
        List<noticeBean> list = new ArrayList<>();
        try {
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                noticeBean noticeBean = new noticeBean();
                noticeBean.setNoticeID(rs.getInt("NoticeID"));
                noticeBean.setNoticeTitle(rs.getString("NoticeTitle"));
                noticeBean.setNoticeContent(rs.getString("NoticeContent"));
                noticeBean.setNoticeTime(Time.getDateTime());
                noticeBean.setAdminName(rs.getString("AdminName"));
                list.add(noticeBean);
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return list;
    }

    /**
     * @param noticeBean 传入要更新的新闻对象，必须包含新闻id值
     * @return 受影响的行数
     */
    public int update(noticeBean noticeBean) {
        Connection conn = DBConn.getConn();
        if (noticeBean.getNoticeID() > 0) {
            try {
                Statement stmt = conn.createStatement();
                String sql = "update notice set noticeTitle='" + noticeBean.getNoticeTitle() + "'"
                        + ",NoticeContent='" + noticeBean.getNoticeContent() + "'"
                        + ",NoticeTime='" + Time.getDateTime() + "'"//更新时使用当前系统时间
                        + ",AdminName='" + "假管理员" + "'" //todo使用添加的管理员名称
                        + " where NoticeId='" + noticeBean.getNoticeID()+ "'";
                return stmt.executeUpdate(sql);
            } catch (SQLException e) {
                e.printStackTrace();
            }
            return 0;
        }
        return 0;
    }

    public int add(noticeBean noticeBean) {
        Connection conn = DBConn.getConn();
        try {// 使用预处理执行插入
            String sql = "insert into notice(NoticeTitle,NoticeContent,NoticeTime,AdminName) values(?,?,?,?)";
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setString(1, noticeBean.getNoticeTitle());
            pmst.setString(2, noticeBean.getNoticeContent());
            pmst.setString(3, (new Date()).toString());
            pmst.setString(4, "临时管理员");//将第一个参数设置为标题内容
            return pmst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    /**
     * 删除功能
     */
    public int deleteNewsByNewID(int noticeID) {
        Connection conn = DBConn.getConn();
        try {
            String sql = "delete from notice where NoticeID=?";
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setInt(1, noticeID);
            return pmst.executeUpdate();
        } catch (SQLException e) {

        }
        return 0;
    }

    public int countPage() {
        Connection conn = DBConn.getConn();
        String sql = "select count(*) from notice";
        try {
            Statement statement = conn.createStatement();
            ResultSet rs = statement.executeQuery(sql);// 获取查询结果集
            if (rs.next()) {
                return (rs.getInt(1)/10) +1;
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return 0;
    }
}
